4 Blue tumblers = between 132g and 168g each
4 Amber tumblers = between 174g and 212g each
Both sets of glasses are definitely hand-made.
Holding them side by side (I'll post a photo when my camera has charged up), the amber glasses are nicer - smoother, more regular shape and better-made. No flaws whatsoever, while the blue glasses have a couple of irregularities in the surface, as if they've been touched with a tool whilst still malleable, and one of the rims is slightly wonky.
The amber glasses all have a circular, ground punty. The blue glasses have had their bases torched. Three of them have a smooth, slightly-indented base, whilst one has been left flat with a dimpled finish.
amber glasses = definitely Stuart
blue glasses = Norfolk Enchants